On Thursday, Dec. 27, two days after confirming her baby news with a Twitter photo of daughter Maxwell Drew sitting next to the words "Big Sis," the Fashion Star mentor, 32, shared another revealing picture, this time of herself.

"Fun in the sun," she wrote below the sexy snapshot, which shows the second-time mom-to-be dressed in a short, red beach cover-up over a matching red bikini. Simpson's baby bump isn't visible in the pic, but her other assets -- namely, her ample cleavage and toned legs -- are on full display.

Simpson has been in a sharing mood this week, ever since confirming her pregnancy on Dec. 25 with the photo of Maxwell. On Wednesday, she posted a second picture, of herself and fiance Eric Johnson, 33, enjoying a walk on the beach in Hawaii, where the couple are enjoying a little holiday vacation.